JP7110050B2 - Laminated sheet and pouch container - Google Patents

Description

The present invention relates to laminated sheets and pouch containers.

For packaging for storing and transporting food, etc., a flexible packaging container is used in which the periphery of a laminated film having a sealant layer on the inner surface is heat-sealed (see, for example, Patent Document 1). . Patent Literature 1 discloses a packaging container having a resin sheet layer, a colored layer formed on the resin sheet layer, and a surface coating layer formed on the colored layer.

Japanese Patent No. 3017399

According to Patent Document 1, by providing a gray ink layer having a hue of 5B to 5P, a saturation of 0, and a brightness of 6 to 7, it is possible to preserve the contents without photodegradation such as fading. However, if the thickness of the ink layer is increased in order to improve the light-shielding property, there are concerns about ink cracking, reduction in film strength, and the like.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a laminated sheet and a pouch container that have high light-shielding properties without using a metal layer.

One aspect of the present invention includes a sealant layer, an adhesive layer, a printed layer, and a base layer, and the printed layer has a Munsell value chroma of 0 or more and less than 1.0 and a brightness of 0. A laminated sheet characterized by including a black printed layer with a ratio of 1.0 or more.

The black printed layer contains 1 to 50% by mass of carbon black, the thickness of the black printed layer is T, and the depth of 0.1 × T from the bonding interface of the black printed layer on the adhesive layer side. The content of isocyanate groups in the black printed layer in is A, and the content of isocyanate groups in the black printed layer at a depth of 0.1 × T from the bonding interface of the black printed layer on the base layer side is B, the A is preferably 1.1 times or more of the B.
The black printed layer preferably contains 1 to 50% by mass of carbon black having an average particle size of 0.01 to 0.05 μm.

One aspect of the present invention is a pouch container, wherein at least one surface is formed from the laminated sheet.

The pouch container is a standing pouch, and has a body formed by joining both side edges of a pair of body sheets, and a bottom formed by joining a bottom sheet to the lower edge of the body and folding into the body. and wherein the bottom sheet may be formed from the laminate sheet.
The pouch container may be a refillable pouch container or a retort pouch container.

ADVANTAGE OF THE INVENTION According to this invention, the laminated sheet and pouch container which were excellent in the light-shielding property can be provided, even if it does not use a metal layer.

It is a sectional view showing one embodiment of a lamination sheet. 1 is a cross-sectional view showing one embodiment of a pouch container; FIG. FIG. 2 is a front view showing an example of a pouch container having a tapered spout at the top. Fig. 2 is a front view showing an example of a substantially rectangular pouch container;

The present invention will be described below based on preferred embodiments.

FIG. 1 is a cross-sectional view schematically showing one embodiment of the laminated sheet of the present embodiment. The laminated sheet 10 has a sealant layer 11, an adhesive layer 12, a printed layer 13, and a substrate layer 14 in this order.

The sealant layer 11 is a layer used for heat sealing the laminated sheet 10 . For example, the laminate sheet 10 is heat-sealed (bonded) by folding the laminate sheet 10 or by facing two or more sheets, with the sealant layer 11 facing inward, and by fusing the sealant layers 11 to each other. In the package composed of the laminated sheet 10, the sealant layer 11 may be the innermost layer.

As the sealant layer 11, for example, a polyolefin resin film such as an unstretched polypropylene (CPP) resin film, an unstretched polyethylene (PE) resin film, a cyclic olefin resin film, or the like can be used. The sealant layer 11 is not limited to a single layer, and may have a structure in which two or more layers of resin films are laminated. The thickness of the sealant layer 11 is, for example, 10 to 100 μm.
Moreover, biomass-derived resin can be preferably used for the resin film of the sealant layer 11 .

As the adhesive layer 12, a configuration in which the base material layer 14 having the printed layer 13 and the sealant layer 11 are adhered can be mentioned. The adhesive used for the adhesive layer 12 is not particularly limited. It can be appropriately selected and used according to such as. The thickness of the adhesive layer 12 is, for example, 0.5 to 5 μm.

Examples of the base material layer 14 include polyethylene terephthalate (PET) resin film, polyamide (PA) resin film, polyethylene naphthalate (PEN) resin film, polyacrylonitrile (PAN) resin film, polycarbonate (PC) resin film, polyimide ( PI) Thermoplastic resin films such as resin films, polyolefin resin films, and polyester resin films (not limited to PET and PEN) can be used. The base material layer 14 is not limited to a single layer, and may have a structure in which two or more layers of resin films are laminated. The thickness of the resin film forming the base material layer 14 is, for example, 5 to 50 μm. The resin film may be colored or may be colorless and transparent. The light transmittance of the resin film is not particularly limited, and may be transparent or opaque, and may be light-shielding or light-transmitting.

The resin film forming the base material layer 14 may include a resin film having a vapor deposition layer. The deposited layer has a gas barrier property that prevents gases such as oxygen and water vapor from permeating through the laminated sheet 10 . Since the laminated sheet 10 having a vapor deposition layer can prevent gas permeation, it is possible to improve the storage stability of the contents. The vapor deposition layer includes vapor deposition layers of inorganic substances such as silicon oxide (eg, silica) and aluminum oxide. When a vapor deposition layer made of a non-metallic material that does not contain a metal (conductor) such as aluminum is used, the laminated sheet 10 that does not contain a metal layer can be formed, so that it can be inspected by a metal detector. Moreover, disposal of the laminated sheet 10 is also easy. A preferred thickness of the deposited layer is, for example, 10 to 500 nm.

The resin film that constitutes the base material layer 14 may include a resin film that functions as a reinforcing layer. As the reinforcing layer, aliphatic polyamide resins such as nylon (6-nylon, 6,6-nylon, etc.), polyester resins such as polyethylene terephthalate (PET), polyolefin resins such as polypropylene (PP) and polyethylene (PE), etc. Available. Among these, oriented resin films such as biaxially oriented nylon (O-Ny), biaxially oriented polyethylene terephthalate (O-PET) and biaxially oriented polypropylene (OPP) are preferred.
In addition, biomass-derived resin can be used for the resin film of the base material layer 14 .

When the substrate layer 14 is composed of a plurality of resin films, an adhesive layer may be provided between each resin film. The adhesive used for the adhesive layer between the resin films constituting the base material layer 14 is not particularly limited, and examples thereof include curable adhesives such as urethane-based adhesives and epoxy-based adhesives, carboxylic acid-modified polyolefin resins, and the like. Adhesive resin, etc., can be appropriately selected and used according to the material of the adherend. The thickness of the adhesive layer between the resin films forming the base material layer 14 is, for example, 0.5 to 5 μm.

The printed layer 13 can be composed of one or more of a black printed layer, a white printed layer, a gray printed layer, a chromatic printed layer, and the like. The printed layer 13 may be provided between the base material layer 14 and the sealant layer 11 , or may be provided between the resin films forming the base material layer 14 . Each layer constituting the printed layer 13 may be formed on the entire surface of the laminated sheet 10 or may be formed on a part of the surface. The layer provided for the purpose of light shielding properties is preferably formed over the entire surface of the laminated sheet 10 . A layer provided for the purpose of design, information display, or the like may be patterned so as to form letters, figures, images, patterns, or the like on the surface.

The white printed layer can be composed of, for example, white ink containing a white pigment and a binder. Examples of white pigments include titanium oxide, zinc white, calcium carbonate, and kaolin. Titanium oxide is particularly preferred. Titanium oxide includes rutile type, anatase type, brookite type and the like, and rutile type is particularly preferable. A preferable thickness of the white printed layer is, for example, 0.1 to 10 μm. The lower limit of the thickness is preferably 0.5 μm or more, more preferably 2.0 μm or more, and most preferably 3.0 μm or more. The upper limit of the thickness is preferably 8 μm or less, more preferably 5 μm or less. A polyurethane resin, an acrylic resin, or the like can be used as the binder. The average particle diameter of the white pigment such as titanium oxide may be 0.3 μm or less or may exceed 0.3 μm, and specific examples include 1 μm or less or 0.1 to 0.3 μm.

The visible light transmittance of the white printed layer is preferably, for example, 60% or less, more preferably 50% or less, in the entire visible light wavelength range (wavelength: 380 to 750 nm). This can improve the storage stability of the contents. A multi-layered structure (two-layered structure) having two or more white printed layers lowers the visible light transmittance and increases the whiteness compared to a single-layered structure. For example, when characters, graphics, images, patterns, etc. are displayed in color, the contrast with the background is increased, making the display easier to see.

The gray printed layer can be composed of gray ink containing a white pigment such as particulate titanium oxide, a black pigment such as particulate carbon black, and a binder. The thickness of the gray printed layer is, for example, 0.1 to 10 μm, preferably 0.5 to 5 μm. The average particle size of titanium oxide contained in gray ink is preferably 0.1 to 0.3 μm, more preferably 0.1 to 0.14 μm. By setting the average particle diameter of titanium oxide to 0.1 μm or more, the visible light transmittance of the gray printed layer can be lowered. By setting the average particle size of the titanium oxide to 0.3 μm or less, it is possible to make the laminated sheet 10 provided with the gray printed layer less likely to change in appearance.

The black printed layer can be composed of black ink containing a black pigment such as particulate carbon black and a binder. The thickness of the black printed layer is, for example, 0.1 to 10 μm, preferably 0.5 to 5 μm. The printed layer 13 preferably includes a black printed layer having a Munsell value saturation of 0 or more and less than 1.0 and a brightness of 0 or more and less than 1.0. Thereby, the printed layer 13 having excellent light shielding properties can be formed. The saturation of the black printed layer is more preferably 0.9 or less, such as 0.7 or less, and the brightness of the black printed layer is more preferably 0.9 or less, such as 0.7 or less. The black printed layer preferably contains 1 to 50% by mass of a black pigment such as carbon black, and specific examples include 1 to 15% by mass.

The average particle size can be measured, for example, by a particle size distribution analyzer based on a laser diffraction scattering method. As the average particle diameter, for example, a 50% cumulative particle diameter (mass basis or volume basis), a mode particle diameter, or the like can be used. As a particle size distribution analyzer, for example, SALD-7000 manufactured by Shimadzu Corporation can be used. As the average particle size, an average value of measured values for a sufficient number (for example, 100 or more) of particles based on an image obtained by observing the particles may be adopted. The image of particles is, for example, an observation image obtained using an optical microscope, electron microscope, or other device. As the particle size of the non-spherical particles, for example, the average value of the longest diameter and the shortest diameter in the observation image may be used.

Carbon black is not particularly limited, but furnace black, thermal lamp black, acetylene black, channel black and the like can be used. The average particle diameter of carbon black is preferably 0.01 μm or more and 0.05 μm or less, for example. The average particle size of carbon black is more preferably 0.01 μm or more and 0.02 μm or less. By using carbon black having an average particle size within the above range, the light-shielding layer 2 that is excellent in light-shielding properties and resistant to cracking or peeling can be obtained. It is not clear why cracking or peeling of the printed layer 13 is less likely to occur when the average particle size of carbon black is within the above range. It is thought that cracking or peeling may become less likely to occur.

DBP absorption of carbon black (according to JIS K6221) can be, for example, 50 to 100 cm ³ /100 g.
The nitrogen adsorption specific surface area (in accordance with JIS K6217) of carbon black can be, for example, 50 to 150 m ² /g.

The chromatic print layer can be composed of a colored ink containing one or more of various pigments such as red, blue, yellow, green, orange, purple, intermediate colors, and a binder, depending on the color. Colored inks may contain achromatic pigments such as white pigments and black pigments depending on the color.

A polyurethane resin, an acrylic resin, or the like can be used as a binder for the ink that constitutes the printing layer. Polyurethane resin is particularly preferred. Examples of polyols used in polyurethane resins as binders include polyether polyols, low-molecular-weight polyols, polyester polyols, polycarbonate polyols, polybutadiene glycols, glycols, and acrylic polyols. Diisocyanate compounds used in polyurethane resins include aromatic diisocyanates, aliphatic diisocyanates, and alicyclic diisocyanates.

The ink used to form each layer of the printed layer 13 is preferably a solvent-type paint in which a pigment is dispersed in a solvent. Solvents include toluene, ethyl acetate, methyl acetate, propyl acetate, methyl ethyl ketone, methyl isobutyl ketone, propyl alcohol, isopropyl alcohol, normal propyl alcohol, 1-methoxy-2-propanol and the like. A printed layer composed of a solvent-based coating can be formed into a thin cured layer by applying and drying the solvent-based coating. Examples of printing methods include offset printing, gravure printing, and screen printing.

When the printed layer 13 is used as a light-shielding layer, it is preferable to laminate one or more white printed layers or gray printed layers on one or both sides of the black printed layer in the thickness direction of the laminated sheet 10. . When the laminate sheet 10 is used as a packaging material, it is preferable to provide at least one white printed layer or gray printed layer on at least the outer side of the black printed layer, because the appearance of the laminated sheet 10 is less likely to change. Here, the outside is the side opposite to the side (inside) where the contents are accommodated.

When the black printed layer contains carbon black as a black pigment or urethane resin as a binder, etc., the reason is not necessarily clear, but it may react with or adsorb to a component derived from the adhesive contained in the adjacent or adjacent adhesive layer. Therefore, the adhesive strength between the printed layer and the adhesive layer can be increased. For example, when the adhesive layer contains a component having an isocyanate group such as a urethane adhesive, the isocyanate group content A in the adhesive layer side portion of the black printed layer is the same as the isocyanate group content in the base layer side portion. When the content is larger than B, the printed layer can be made difficult to crack. Here, when the thickness of the black printed layer is T, the content A of the adhesive layer side portion is the black printed layer at a depth of 0.1 × T from the bonding interface of the black printed layer on the adhesive layer side. A may be the content of isocyanate groups in the layer. Further, the content B in the base layer side portion may be the content B of the isocyanate group in the black printed layer at a depth of 0.1 × T from the bonding interface of the black printed layer on the base layer side. . When the content A in the portion on the adhesive layer side is 1.1 times or more the content B in the portion on the base layer side, the printed layer can be made more resistant to cracking, which is preferable. The ratio of the content B to the content A is preferably 1.1 times or more, more preferably 1.2 times or more, and can be 1.3 times or more. The ratio of the content B to the content A can be 2.0 or less, and can also be 1.5 or less. The isocyanate group content may be the total value of the content derived from the adhesive layer and the content derived from the binder.

The visible light transmittance (wavelength: 380 to 750 nm) of the laminated sheet 10 is preferably, for example, 20% or less over the entire wavelength range of visible light. By setting the visible light transmittance to 20% or less, the storage stability of the contents can be enhanced. From the viewpoint of light shielding properties, a more preferable visible light transmittance is, for example, 5% or less.

The method for producing the laminated sheet is not particularly limited. and laminating through. As the lamination method, dry lamination is preferable from the viewpoint of productivity.

FIG. 2 is a cross-sectional view showing one embodiment of a pouch container. The pouch container 20 of this embodiment includes a body formed by joining both side edges of a pair of body sheets 21 to each other, and a bottom sheet 22 joined to the lower edge of the body sheet 21 and between the body sheets 21. It is a standing pouch with a folded bottom. The joints between the sheets can be formed by heat-sealing the sealant layers provided in the innermost layers of the sheets.

The bottom sheet 22 is folded with the folding line 22a facing upward. The lower edge 22b of the bottom sheet 22 and the lower edge 21b of the body sheet 21 are joined to form a lower edge joint. The trunk sheet 21 has a length from the upper edge 21a to the lower edge 21b that is longer than the length from the folding line 22a of the bottom sheet 22 to the lower edge 21b. Between the body sheets 21 on the bottom sheet 22, a content storage section 23 is formed. In addition, an opening 24 for taking in and out contents can be formed above the accommodating part 23 .

3 and 4 are front views showing different specific examples of the pouch container 20 of FIG. 2, respectively. The pouch container 20A shown in FIG. 3 has a tapered spout 26 at the top. The pouch container 20B shown in FIG. 4 has a substantially rectangular shape as a whole, with the upper edge 21a of the body sheet 21 being substantially parallel to the lower edge 21b. Both side edges of the trunk sheet 21 are joined by side edge joining portions 21s. The opening 24 can be sealed by an upper edge joint 25 joining between the upper edges 21 a of the body sheet 21 .

Notches may be provided in the vicinity of the side edge joints 21s, the upper edge joints 25, the spout 26, etc., in order to facilitate the opening of the pouch containers 20, 20A, 20B. Although the shape of the notch is not particularly limited, it may be V-shaped, U-shaped, or I-shaped. If the pouch container is to be resealable, a closure such as a spout may be provided between the body sheets 21, for example. The spout has a cylindrical portion through which contents can pass, and the tip of the cylindrical portion can be closed with a cap, plug, or the like.

The laminated sheet 10 described above can be used to form at least one surface constituting a pouch container. Laminate sheet 10 can be used for bottom sheet 22 in pouch containers 20, 20A, 20B described above. Since the printed layer of the laminated sheet 10 described above has a high light-shielding property, sufficient light-shielding property can be obtained without increasing the thickness. In addition, since the laminate sheet 10 described above has improved bonding strength between the printed layer and the adhesive layer, ink cracking and reduction in film strength are less likely to occur. Therefore, when the laminated sheet 10 described above is used for the bottom sheet 22, deterioration of the printed layer at the folding line 22a can be suppressed.

When the contents are packaged in the pouch containers 20, 20A, and 20B, for example, a method of filling the contents from the opening 24 into the containing portion 23 and then sealing the opening 24 can be adopted. The pouch containers 20, 20A, and 20B filled with contents can be subjected to high-temperature sterilization such as retort sterilization and boiling sterilization. Retort sterilization refers to a sterilization method that uses steam or hot water at a temperature above 100° C., such as 110-140° C., and heats under pressure above atmospheric pressure. The heating time is not particularly limited, but may be, for example, 1 to 90 minutes. Depending on the properties of the contents, it is possible to fill without high temperature sterilization. Moreover, after sterilizing the pouch containers 20, 20A, and 20B before filling, the contents can be filled in a clean environment to obtain an aseptic package without high-temperature sterilization.

The use of the pouch container is not particularly limited, but examples include a refillable pouch container, a retort pouch container, and the like. A refillable pouch container is a pouch container filled (or used for filling) with a content to be refilled into another container (for example, a bottle container). A retort pouch container is a pouch container that has been (or is intended to be) subjected to retort sterilization after filling. The contents of the pouch container are not particularly limited, such as liquids, powders, granules, small pieces, lumps, and moldings. Examples include foods, beverages, seasonings, cosmetics, detergents, bleaches, waxes, and hair care products. (shampoo, rinse, conditioner, etc.), electronic parts, medical parts, medical equipment parts, precision machine parts, and the like.

Although the present invention has been described above based on preferred embodiments, the present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the gist of the present invention.
Since the laminated sheet of the present embodiment has excellent light-shielding properties, it can be used as a light-shielding sheet, a design sheet, a decorative sheet, etc., in addition to packaging materials other than pouch containers, such as lid sheets for cup containers and bottle containers.

EXAMPLES The present invention will be specifically described below with reference to Examples.

As an example of the printed layer, a printed layer including a black printed layer was formed on a resin film made of nylon. In Examples 1 and 3 and Comparative Examples 1 and 2, the structure was made up of substrate layer/white printed layer/black printed layer. In Example 2, the composition of the substrate layer/black printed layer was used. In Comparative Examples 3 and 4, the structure was made up of substrate layer/white printed layer/gray printed layer. The printed surface of each sample was measured under the following measurement conditions. Table 1 shows the results.

Measuring machine: Spectroscopic colorimeter SE-2000 manufactured by Nippon Denshoku Industries Co., Ltd.
Measured value: Munsell value (hue H, brightness V, saturation C)
Light source: C light source, 2 degrees Measurement surface: printed surface

As shown in Table 1, Examples 1-3 had high quality black printed layers with low V and C saturation. Incidentally, the hue PB means purple blue, but since the saturation C is low, it is actually an achromatic color N. When the white printed layer was provided under the black printed layer, the chroma C tended to be lower than when the resin film was directly under the black printed layer. In addition, when the light transmittance of a sample in which a polyethylene sealant was laminated via an adhesive layer on the side of these black printed layers was measured, the light transmittance was approximately 0.0% at a wavelength of 400 nm, approximately 0.2% at a wavelength of 450 nm, and It was about 0.4% at 500 nm, about 1% at 600 nm, about 1.5% at 700 nm, and about 3% at 800 nm.

In A/B, T is the thickness of the black printed layer, and A is the content of isocyanate groups in the black printed layer at a depth of 0.1 × T from the bonding interface of the black printed layer on the adhesive layer side, It is the ratio of A to B, where B is the content of isocyanate groups in the black printed layer at a depth of 0.1×T from the bonding interface of the black printed layer on the substrate layer side.

As for the light shielding property, the visible light (wavelength: 380 to 750 nm) transmittance of the laminate was measured using a spectrophotometer (spectrophotometer V-670, manufactured by JASCO Corporation). When the visible light transmittance is 15% or less, it is evaluated as “○”, when the visible light transmittance is more than 15% and 20% or less, it is evaluated as “Δ”, and the visible light transmittance is more than 20%. It was evaluated as "x" when it was applied.

Regarding the cracking of the printed layer, a force (approximately 2 kgf) in the bending direction (compressive direction) was applied to the bending portion by rolling a cylindrical pressure roller over the entire length of the bending portion over the entire length of the bending portion. (Note that 1 kgf = about 9.80 N.) was applied, and with the folded portion fixed to the main body portion with a fixing metal fitting, the laminated body was subjected to heat treatment at 90 ° C. for 30 minutes, and then the folded portion was opened. We evaluated the appearance of the inner surface of the bent portion. Specifically, 10 samples were tested, and the appearance of the inner surface of the bent portion was evaluated. Among the 10 samples, 2 or less samples showed a change in the appearance (discoloration) of the bent portion. When it was 9 or more, it evaluated as "x".

The adhesion strength is measured by laminating a polyethylene sealant via an adhesive layer on the side of the printed layer laminated on the base material, peeling off the adhesive part between the base material and the polyethylene sealant, and measuring the strength between the layers via the printed layer. Adhesion strength was measured. Under an environment of 23° C. 50%, the maximum load (N) was measured by peeling in the 90° direction at 5 mm/min, and the adhesive strength (N/25.4 mm) was calculated from the width of the adhesive portion of 25.4 mm. When the adhesive strength was 5 N/25.4 mm or more, it was evaluated as "◯"; when it was 3 N/25.4 mm or more and less than 5 N/25.4 mm, it was evaluated as "Δ";

The printed layers according to the above examples were applied to laminated sheets for refill or retort applications. Examples of laminated sheets for refills include a two-layer structure of 15 µm nylon/120 µm polyethylene, a three-layer structure of 12 µm polyethylene terephthalate/15 µm nylon/100 µm polyethylene, and a three-layer structure of 15 µm nylon/12 µm evaporated polyethylene terephthalate/100 µm polyethylene. are mentioned. In addition, examples of the configuration of laminated sheets for retort applications include a four-layer configuration of 12 μm polyethylene terephthalate/12 μm vapor-deposited polyethylene terephthalate/15 μm nylon/60 μm unstretched polypropylene, and a three-layer configuration of 12 μm vapor-deposited polyethylene terephthalate/15 μm nylon/80 μm unstretched polypropylene. are mentioned. In each of the laminated sheets according to these configuration examples, an adhesive layer such as a urethane-based adhesive layer is provided between the layers of the resin film. Moreover, a printed layer is provided on any resin film among any one or two or more layers.

As the white ink for forming the white printed layer, 40 parts by weight of rutile titanium oxide (IV) (white pigment), 15 parts by weight of a urethane resin binder, and 0.5 parts by weight of silica particles are mixed in a mixed solvent. Dispersed ones are mentioned. The mixed solvent is a solvent obtained by mixing ethyl acetate, isopropyl alcohol, and propyl acetate at a ratio (by weight) of 70:20:10. The average particle size of titanium oxide was 0.10 μm. The thickness of the white printed layer is about 1.0 μm, and two or more layers of this may be laminated.

The black ink for forming the black printed layer may be obtained by mixing and dispersing 10 parts by weight of carbon black, 15 parts by weight of urethane resin binder and 0.5 parts by weight of silica particles in a mixed solvent. The mixed solvent is a solvent obtained by mixing ethyl acetate, isopropyl alcohol, 1-methoxy-2-propanol and 1-propanol at a ratio of 60:20:15:5 (by weight). The average particle size of carbon black was 0.02 μm. In this case, the content of carbon black in the black printed layer after drying is about 40%, but it may be about 5%, about 10%, about 15%, about 25%, or the like.

The gray inks used in Comparative Examples 3 and 4 were obtained by mixing white ink and black ink such that carbon black in black ink was 2 parts by weight per 100 parts by weight of titanium oxide in white ink.

DESCRIPTION OF SYMBOLS 10... Laminated sheet 11... Sealant layer 12... Adhesive layer 13... Printing layer 14... Base material layer 20, 20A, 20B... Pouch container, 21... Body sheet, 21a... Upper edge of body sheet , 21b... Lower edge of trunk sheet 21s... Side edge joint of trunk sheet 22... Bottom sheet 22a... Folding line of bottom sheet 22b... Lower edge of bottom sheet 23... Storage part 24... Opening , 25 ... Upper edge junction, 26 ... Spout.

Claims (5)

Having a sealant layer, an adhesive layer, a printing layer, and a base layer,
The printed layer includes a black printed layer having a Munsell value chroma of 0 or more and less than 1.0 and a brightness of 0 or more and less than 1.0,
The black printed layer contains 1 to 50% by mass of carbon black,
The thickness of the black printed layer is T, the content of isocyanate groups in the black printed layer at a depth of 0.1 × T from the bonding interface of the black printed layer on the adhesive layer side is A, and the When the content of isocyanate groups in the black printed layer at a depth of 0.1 × T from the bonding interface of the black printed layer on the base layer side is B, the A is 1.1 times or more the B. A laminated sheet characterized by: 2. The laminate sheet according to claim 1 , wherein the black printed layer contains 1 to 50% by mass of carbon black having an average particle size of 0.01 to 0.05 μm. A pouch container, wherein at least one surface is formed from the laminated sheet according to claim 1 or 2 . The pouch container is a standing pouch, and has a body formed by joining both side edges of a pair of body sheets, and a bottom formed by joining a bottom sheet to the lower edge of the body and folding into the body. and
4. The pouch container of claim 3 , wherein said bottom sheet is formed from said laminated sheet. 5. The pouch container according to claim 3 , wherein the pouch container is a refillable pouch container or a retort pouch container.

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